Lightroom CC 2018: Constant crashes macOS 10.13.2 high Siera

Adjusting most simple things like, cropping and exposure is almost impossible...all the tools respond extremely slow. Sometimes I have to wait for more then a minute for a crop to work. It is impossible to work with it. In the last few days I have tried whatever I could think of to solve the problem. But unfortunately this is terrible. I simply can not use it. I really hope this can be fixed soon otherwise I would like to cancel my purchase.